Extract .babylon materials to each json file

extract-babylon-material.sh

#!/bin/bash

FILE_PATH="*.babylon"
TEXTURE_OUT="./textures/"
JSON_OUT="./"

# Ensure FILE_PATH and TEXTURE_OUT are defined
if [[ -z "$FILE_PATH" || -z "$TEXTURE_OUT" ]]; then
  echo "FILE_PATH and TEXTURE_OUT must be set."
  exit 1
fi

# Process each material
jq -r '.materials[] | .name' "$FILE_PATH" | while read -r material_name; do
  # Extract all necessary data in one jq call
  jq -r --arg name "$material_name" '
    .materials[] | select(.name==$name) | to_entries[] | 
    select(.value | type == "object") | 
    (.key | sub("Texture$"; "")) as $texture_type |
    {key: $texture_type, value: .value} | 
    .value | to_entries[] | 
    select(.value | type == "string" and test("^data:image/(.*);base64,")) | 
    "\($texture_type) \(.value)"' "$FILE_PATH" |
  while IFS=" " read -r texture_type base64String; do
    # Process the base64String
    extension=$(echo "$base64String" | sed -n 's/^data:image\/\([a-zA-Z]*\);base64,.*/\1/p')
    if ! echo "$base64String" | sed 's/^data:image\/[a-zA-Z]*;base64,//' | base64 --decode > "${TEXTURE_OUT}${material_name}_${texture_type}.${extension}"; then
      echo "Failed to decode and save base64 string for ${material_name}_${texture_type}.${extension}"
      continue
    fi
  done

  # Update the JSON
  jq --arg name "$material_name" --argjson extmap '{"png":"png","jpeg":"jpg","jpg":"jpg"}' '
    .materials[] | select(.name==$name) | 
    walk(if type == "object" and has("base64String") then
      .name = ($name + "_" + path(.)[-1] + "." + ($extmap[(.base64String | split(",")[0] | split("/")[1] | split(";")[0])] // "null")) |
      .url = ($name + "_" + path(.)[-1] + "." + ($extmap[(.base64String | split(",")[0] | split("/")[1] | split(";")[0])] // "null")) |
      del(.base64String)
    elif type == "object" then 
      with_entries(
        if (.key | test("Texture$"; "i")) and ((.value | type) == "object") then
          (.key | sub("Texture$"; "")) as $texture_type |
          .value.name = ($name + "_" + $texture_type) |
          .value.url = ($name + "_" + $texture_type)
        else
          .
        end
      )
    else
      .
    end
    )' "$FILE_PATH" > "${JSON_OUT}${material_name}.json"
done